lecture15 - ATermFall2008 Lecture#15: ReadingforToday...

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Foundations of Embedded Systems A Term Fall 2008 Lecture #15:  Introduction to Serial Interfaces Reading for Today: Articles, User's Manual Ch 15 Reading for Next Class: User's Manual Ch 15, External Temp Sensor information Lab #2 (on web): Due Tuesday 9/30/2008 (in class) HW #4 (on web):            Due Monday 9/29/08                     Exam #2 – Tuesday 9/30/2008 Serial Interfaces – USART and SPI Parallel Interfaces  = Each bit has its own electrical connection (interconnect, trace, wire)   >> Advantages = Fast, easier to synchronize (1 clock edge transfers all bits together)     >> Used almost exclusively inside a CPU (or other) chip
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  >> Disadvantage = Each bit must have its own electrical connection Serial Interfaces  – Bits sent one after another along a single connection    >> Used almost exclusively to make connections off-chip (and off-computer, through           the Internet, out to the Mars Rover, etc)   >> Advantages = Simpler/fewer connections between CPU and peripheral (2-4 lines)         Device Select (CS)           Sychronizing CLK (SCLK)         Data Line(s) (SDI and SDO)         Common ground (GND)   >> “Connection”  =  PCB trace, wire, RF, acoustic, optical, etc.   >> Disadvantages = Slower, more complicated synchronization, potential timing issues
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Universal Synchronous/Asynchronous Receive Transmitter (USART)    >> Basically acts as a parallel-to-serial and serial-to-parallel converter
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